Furnace.



UNITED STATES Patented August Q, 1904.

PATENT OFFICE.

FRED P. SMITH, OF NEW YORK, N.

Y., ASSIGNOR TO THE MUNICIPAL OF DELAVVARE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. '766,849, dated August 9, 1904.

Application filed August 5, 1902.

To all whom it Tila/Z] concern:

Be it known that I, FRED P. SMITH, a citizen of the United States, and a resident of the city, county, and State of New York, have invented a new and usefullmprovement in Furnaces, of which the following is a full specification. i

My invention relates especially to that class of furnaces adapted to be used for burning garbage or other refuse matter, and has for its object the attainment of the best practical results in obtaining perfect combustion and Consumption of the material and while preventing the escape of offensive odors performs its work With the minimum amount of labor in stoking.

The accompanying drawings illustrate the invention, of which- Figure 1 is a longitudinal sectional View of a 'urnace provided with fire-grate and refusegrates, showing the upper damper closed and the lower one open. Fig. 2 is a sectional View of the same, showing the upper damper open and the lower one closed; Fig. 3, a vertical sectional View on line a' w, Fig. 1.

l l are the walls of the furnace, closed at the top and provided with the doors 2 2, through which the material to be consumed is duinped or thrown into the furnace.

3 is a grate upon which the fire is made, the fuel entering through the door 4:. This grate consists of a series of hollow grate-bars 5, constructed as shown in my application for Letters Patent filed in the Patent Ofiice September 10, 1901. 6 is an ash-pit below the bars,provided with its door 7. The grate-bars 5 are turned up at their rear ends, as shown at 8, Fig. 3, in order to discharge the heated air passing through them behind and above this grate to thereloy supply oxygen for more complete combustion. Beyond this fire-grate is the bridge-wall 9, and located beyond the bridge-wall are a series of garbage or refuse grates 10 10, separated from each other by the arched walls 11 11. These grates are located in positions to receive the refuse Inateral which falls through the dump-doors 2 2.

Serial No. 118,&54. (No model.)

As illustrated in. the drawings, these garbagegrates are shown as three in number; but the furnace will operate as well with two or any number of grates more than the number shown. They are also arranged in steps one above the other to facilitate stoking and to easily arrange and dispose of the ret'use matter according to its condition and also to remove it to a hotter or cooler part of the chamber, as required. By this arrangement the least combustible matter may be placed upon the upper grate and drawn from thence upon those in front of and below it. These grates are also provided With the hollow bars 5 5, arranged as shown and described in the tiregrate and for the same purpose, to discharge the air passing through thom over and above the material lying upon them. The door 12 is provided in order to stier the material or bank it upon one or more of the grates, as desired. Stoke-doors may also be placed in the side walls of the furnace, if desired. This arrangement practically divides the furnace into an upper and a lower chamber, and the spaces between the grate-bars allow the passage of air and gases and also the drippings from the upper to the lower chamber.

In the lower chamber and below the garbage-grates I have placed an evaporating-pan 13. It is suitably secured to the walls of the furnace and extends from the rear wall forward, leaving an open space or passage i& between its forward end and the bridge-wall 9. This pan catches the drippings from the wet material on the grates located above it.

At the rear of the fu'nace .l. have placed the dampers 15 and 16, which lead direct to the chimney, and below the evaporating-pan the passage-way 17, always open to the chimney. The dampers are provided with suitable rods 18 to open and close or partially open and close them at will. The damper 15 is placed at the end of the upper chamber above the grates. 16 is located below the grates and above the evaporating-pan and the passageway 17 at the entrance to the chmney below the evaporating-pan.

19 and 20 are clean-out doors.

Another grate, 21, may be placed in the upper ohamber below the door 12. This grate will receive the first and most direct action of heat.

From the foregoing description of this device its advantages are apparent. When the fuel is lighted on the fire-grate 3 and the upper damper 15 is open, the heat passes over the garbage-grates direct to the chimney, carrying ofi the fumes and gases arising from the refuse matter and' at the same time drying the material, while the surplus moisture not carried away drips into the evaporating-pan 13. At the same time the heated air passing.

through the grate-bars is discharged above and Supplies oxygen for combustion and the nauseous odors are either consumed or passed off into the chimney. When the upper damper 15 is closed and 16 open, the air and gases are drawn through the garbage and their grates and pass off through the damper 16, carrying Withit the vapors consumed and unconsumed from the garbage above and the evaporating-pan below. When both dampers are closed, the air and gases pass down around the end of the evaporating-pan, through the passage 14, and out through 17 to the chimney. The air passing through the hollow grate-bars of the garbage-grates adds an additional supply of oxygen for combustion, and by stirring or banling the garbage on the grates the air passing down may be directed through any one or more of the grates, asrequired.-

What I claim, and desire to secure by Letters Patent, is-

l. In a furnace for burning ret'use matter a fire-grate provided with hollow grate-bars arranged to direct the air passing through them into the chamber above the grate, in combination With one or more refuse-grates also provided with hollow grate-bars through which a current of air is induced and directed above the grates and dampers provided with means for opening and closing and located above and below the refuse-grates whereby the heat is drawn over or through the matter on the grates in its passage to the chimney.

2. In a furnaoe for burning refuse matter a lire-grate, in combination with one or more grates forrefuse matter, arranged in steps, the rear grates higher than the forward ones, dampers leading to the chimney,provided with means for opening and closing, and stokingdoors suitably arranged in the Walls of the furnace to thereby faclitate the manipulation of the matter on the grates.

I l n testimony Whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 'th day of May, 1902.

FRED P. SMITH.

Witnesses:

JOHN H. DUVALL, M. TURNER. 

